Briefcase



FIG. 1 is a perspective view of the briefcase of the invention;

FIG. 2 is a top plan view of the briefcase of the invention;

FIG. 3 is a front view of the briefcase of the invention;

FIG. 4 is a left side view of the briefcase of the invention;

FIG. 5 is a right side view of the briefcase of the invention;

FIG. 6 is a back view of the briefcase of the invention; and,

FIG. 7 is a bottom plan view of the briefcase of the invention.

The broken line showing of a shoulder strap in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. In all other cases throughout the drawing disclosure, the broken lines represent stitching and do form a part of the claimed design. 

The ornamental design for a briefcase, as shown and described. 